From: Milton Miller <miltonm@bga.com>
Date: Fri, 10 Oct 2008 01:56:44 +0000 (+0000)
Subject: powerpc/xics: Reduce and comment xics IPI use of memory barriers
X-Git-Tag: v2.6.28-rc1~569^2~13
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=199f45c45e8d4f58a5f568464be933534460eb82;p=pandora-kernel.git

powerpc/xics: Reduce and comment xics IPI use of memory barriers

A single full sync (mb()) is requrired to order the mmio to the qirr reg
with the set or clear of the message word.  However, test_and_clear_bit
has the effect of smp_mb() and we are not doing any other io from here,
so we don't need a mb per bit processed.

Signed-off-by: Milton Miller <miltonm@bga.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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